Units such as USB sticks virus users to install the worm, according to investigators.

“Automatic” to the Vista and the first version of Windows 7, the program automatically searches for removable drives.

But the virus is the process of opening the folder. Click with the mouse, the worm is installed.

Then he tries one of a number of web servers to download another program to control infected computers.

Bad Boys

The worm is an extremely clever way to determine how to contact the server, so the F-Secure chief research officer Mikko Hyppönen.

“This is a complex algorithm that changes daily and is based on the time of the public Web sites, such as Baidu.com and Google.com,” said Hyppönen in a blog.

“This makes it impossible, and / or practical significance for us, for all the good number – most of them never before in the first place.

But the bad news is only necessary to determine possible future registration of the domain, and the site – and then have access to the infected machines, “he added.

In addition, it was found that the virus will automatically turn off the automatic Windows Update to prevent infection.

As the virus – also known as Downadup – has become, it is estimated that 9 of the computer world, the number of cases of the virus was.

The Ministry of Defense has been fighting an outbreak of the virus through its network of more than two weeks, and on Tuesday, a network of hospitals on the basis of Sheffield, said that the website is a directory of more than 800 of their computers were infected.

Users download the KB958644 Security Update for Microsoft to minimize the risk of infection.